Candidate Quantum Spin Liquid in the Ce\textsuperscript{3+} Pyrochlore Stannate Ce${}_2$Sn${}_2$O${}_7$

Abstract

We report the low temperature magnetic properties of Ce${}_2$Sn${}_2$O${}_7$, a rare-earth pyrochlore. Our susceptibility and magnetization measurements show that due to the thermal isolation of a Kramers doublet ground state, Ce${}_2$Sn${}_2$O${}_7$ has Ising-like magnetic moments of $\sim 1.18$ ${\mu }_{\mathrm{B}}$. The magnetic moments are confined to the local trigonal axes, as in a spin ice, but the exchange interactions are antiferromagnetic. Below 1 K the system enters a regime with antiferromagnetic correlations. In contrast to predictions for classical $⟨111⟩$-Ising spins on the pyrochlore lattice, there is no sign of long-range ordering down to 0.02 K. Our results suggest that Ce${}_2$Sn${}_2$O${}_7$ features an antiferromagnetic liquid ground state with strong quantum fluctuations.

6 pages, 4 figures

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